Use DIB_GRUB_TIMEOUT to set boot timeout

We currently re-run all the grub setup in 99-fix-grub-timeout which
shouldn't really be necessary (actually a little problematic; although
this is dib's fault, see Ibaaa81124098f3c6febe48e455d3e1cd0a5f1761)

Use the new timeout flag to set this in the bootloader element
directly.

I think it is also an advantage that if you build a testing image with
./tools/build_image.sh this is configurable now ... having to fiddle
the bootloader for debugging is something that happens more than you'd
like.

This is supported since dib 1.26.0

Change-Id: Iafc660a9a8c072af6bf1fd5e51c419abccef4d54

nodepool/elements/nodepool-base/finalise.d/99-fix-grub-timeout

@@ -1,44 +0,0 @@
-#!/bin/bash
-# Copyright (C) 2014 Hewlett-Packard Development Company, L.P.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-# implied.
-#
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# This is done in 50 because the vm element has, at 51, an bunch of code
-# for properly handling grub. All we need to do here is get our values
-# in to the files.
-
-# dib-lint: disable=setu setpipefail
-if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
-    set -x
-fi
-set -e
-
-# Set grub timeout to zero to save boot time.
-if [ -f /etc/default/grub ] ; then
-    sed -i -e 's/^GRUB_TIMEOUT=[0-9]\+/GRUB_TIMEOUT=0/' /etc/default/grub
-    if which update-grub &> /dev/null ; then
-        update-grub
-    else
-        if [[ $DISTRO_NAME == gentoo ]]; then
-            GRUB_CFG=/boot/grub/grub.cfg
-        else
-            GRUB_CFG=/boot/grub2/grub.cfg
-        fi
-        # If update-grub isn't available, use grub2-mkconfig directly
-        /usr/sbin/grub2-mkconfig -o "${GRUB_CFG}"
-    fi
-elif [ -f /boot/grub/grub.conf ] ; then
-    sed -i -e 's/^timeout=[0-9]\+/timeout=0/' /boot/grub/grub.conf
-fi

nodepool/nodepool.yaml

@@ -909,6 +909,7 @@ diskimages:
       DIB_APT_LOCAL_CACHE: '0'
       DIB_DISABLE_APT_CLEANUP: '1'
       DIB_DISTRIBUTION_MIRROR: http://ftp.us.debian.org/debian/
+      DIB_GRUB_TIMEOUT: '0'
   - name: ubuntu-precise
     elements:
       - ubuntu-minimal
@@ -928,6 +929,7 @@ diskimages:
       DIB_APT_LOCAL_CACHE: '0'
       DIB_DISABLE_APT_CLEANUP: '1'
       FS_TYPE: ext3
+      DIB_GRUB_TIMEOUT: '0'
   - name: ubuntu-trusty
     elements:
       - ubuntu-minimal
@@ -947,6 +949,7 @@ diskimages:
       DIB_IMAGE_CACHE: /opt/dib_cache
       DIB_APT_LOCAL_CACHE: '0'
       DIB_DISABLE_APT_CLEANUP: '1'
+      DIB_GRUB_TIMEOUT: '0'
   - name: ubuntu-xenial
     elements:
       - ubuntu-minimal
@@ -967,6 +970,7 @@ diskimages:
       DIB_IMAGE_CACHE: /opt/dib_cache
       DIB_APT_LOCAL_CACHE: '0'
       DIB_DISABLE_APT_CLEANUP: '1'
+      DIB_GRUB_TIMEOUT: '0'
   - name: centos-7
     elements:
       - centos-minimal
@@ -985,6 +989,7 @@ diskimages:
       DIB_CHECKSUM: '1'
       DIB_IMAGE_CACHE: /opt/dib_cache
       QEMU_IMG_OPTIONS: compat=0.10
+      DIB_GRUB_TIMEOUT: '0'
   - name: fedora-24
     elements:
       - fedora-minimal
@@ -1025,3 +1030,4 @@ diskimages:
       DIB_CHECKSUM: '1'
       DIB_IMAGE_CACHE: /opt/dib_cache
       QEMU_IMG_OPTIONS: compat=0.10
+      DIB_GRUB_TIMEOUT: '0'

tools/build-image.sh

@@ -55,6 +55,10 @@ fi
 ## This will get dib to drop you into a shell on error, useful for debugging
 # export break="after-error"
 
+## If you need to debug the boot, setting this longer might help you
+## break into the grub console.  Or set it to 0 for fast boot.
+# export DIB_GRUB_TIMEOUT=10
+
 # The list of elements here should match nodepool/nodepool.yaml
 disk-image-create -x --no-tmpfs -o $IMAGE_NAME \
     $DISTRO \